# 90% confidence interval for a population proportion.

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In a study of injuries in intermurial sports it was found that among 95 injured lacross players, 20 had read the rules of lacross. Among 875 intermural lacrosse participants 665 reported that they had read the rules of the game. Use the formula for margin of error and the z-score table to find the 90% confidence intervel estimate of the percentage of injured intermural lacross players who have read the rules.

________% < p < _______%

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This solution finds a 90% confidence interval for a population proportion.

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